Rails - Oct 2010 - Authlogic: rendering the login form as a partial on every page of my site

Hi,

I''m trying to setup the Authlogic gem. I''ve followed this
tutorial:
(because I''m using Rails 3)
http://www.logansbailey.com/2010/10/06/how-to-setup-authlogic-in-rails-3/

All of this works. But now I''d like to render the login form as a
partial on every page of my site.

1) I''ve rendered the partial in my application.html.erb file as
followed:

<%= render :partial => "user_sessions/form" %>

2) When I start my server and try rendering my index view of my home
controller, I get the following error:

undefined method `model_name'' for NilClass:Class
Extracted source (around line #1):
1: <%= form_for(@user_session) do |f| %>
2:   <% if @user_session.errors.any? %>
3:     <div id="error_explanation">
4:       <h2><%= pluralize(@user_session.errors.count,
"error") %>
prohibited this user_session from being saved:</h2>

3) I figured out I had to make a new @user_session var in the action
method of my controller for every view I''d like to render my login
form partial on.

4) I''ve put @user_session = UserSession.new in the
"new"-action-method
in my home controller and so my index view rendered fine. But now I''d
like to render my login form on every page of my site.

Is there a way to set the @user_session for every action? Like in the
application_controller? How would you do that?

Thank you,
Mathew

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On Sat, Oct 16, 2010 at 8:33 AM, mattyh88
<mathew.hucks-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Hi,
>
> I''m trying to setup the Authlogic gem. I''ve followed this
tutorial:
> (because I''m using Rails 3)
> http://www.logansbailey.com/2010/10/06/how-to-setup-authlogic-in-rails-3/
>
> All of this works. But now I''d like to render the login form as a
> partial on every page of my site.
>
> 1) I''ve rendered the partial in my application.html.erb file as
> followed:
>
> <%= render :partial => "user_sessions/form" %>
>
> 2) When I start my server and try rendering my index view of my home
> controller, I get the following error:
>
> undefined method `model_name'' for NilClass:Class
> Extracted source (around line #1):
> 1: <%= form_for(@user_session) do |f| %>
> 2:   <% if @user_session.errors.any? %>
> 3:     <div id="error_explanation">
> 4:       <h2><%= pluralize(@user_session.errors.count,
"error") %>
> prohibited this user_session from being saved:</h2>
>
> 3) I figured out I had to make a new @user_session var in the action
> method of my controller for every view I''d like to render my login
> form partial on.
>
> 4) I''ve put @user_session = UserSession.new in the
"new"-action-method
> in my home controller and so my index view rendered fine. But now
I''d
> like to render my login form on every page of my site.
>
> Is there a way to set the @user_session for every action? Like in the
> application_controller? How would you do that?
>
You should able to do this in the application_controller:

before_filter :new_user_session

private

def new_user_session
  @new_user_session = UserSession.new
end

Try that, should then have the @new_user_session available to you since all
controllers inherit from application controller.
>
> Thank you,
> Mathew
>
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>
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thanks!
works like a charm :)

On 17 okt, 01:41, David Kahn
<d...-rfEMNHKVqOwNic7Bib+Ti1W1rNmOCjRP@public.gmane.org>
wrote:
> On Sat, Oct 16, 2010 at 8:33 AM, mattyh88
<mathew.hu...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Hi,
>
> > I''m trying to setup the Authlogic gem. I''ve followed
this tutorial:
> > (because I''m using Rails 3)
>
>http://www.logansbailey.com/2010/10/06/how-to-setup-authlogic-in-rail...
>
> > All of this works. But now I''d like to render the login form
as a
> > partial on every page of my site.
>
> > 1) I''ve rendered the partial in my application.html.erb file
as
> > followed:
>
> > <%= render :partial => "user_sessions/form" %>
>
> > 2) When I start my server and try rendering my index view of my home
> > controller, I get the following error:
>
> > undefined method `model_name'' for NilClass:Class
> > Extracted source (around line #1):
> > 1: <%= form_for(@user_session) do |f| %>
> > 2:   <% if @user_session.errors.any? %>
> > 3:     <div id="error_explanation">
> > 4:       <h2><%= pluralize(@user_session.errors.count,
"error") %>
> > prohibited this user_session from being saved:</h2>
>
> > 3) I figured out I had to make a new @user_session var in the action
> > method of my controller for every view I''d like to render my
login
> > form partial on.
>
> > 4) I''ve put @user_session = UserSession.new in the
"new"-action-method
> > in my home controller and so my index view rendered fine. But now
I''d
> > like to render my login form on every page of my site.
>
> > Is there a way to set the @user_session for every action? Like in the
> > application_controller? How would you do that?
>
> You should able to do this in the application_controller:
>
> before_filter :new_user_session
>
> private
>
> def new_user_session
>   @new_user_session = UserSession.new
> end
>
> Try that, should then have the @new_user_session available to you since all
> controllers inherit from application controller.
>
>
>
>
>
> > Thank you,
> > Mathew
>
> > --
> > You received this message because you are subscribed to the Google
Groups
> > "Ruby on Rails: Talk" group.
> > To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > To unsubscribe from this group, send email to
> >
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org<rubyonrails-talk%2Bunsubscrib
e@googlegroups.com>
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/rubyonrails-talk?hl=en.
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mattyh88 <mathew.hucks@...> writes:
> 
> thanks!
> works like a charm :)
> 
> On 17 okt, 01:41, David Kahn <d...@...> wrote:
> > On Sat, Oct 16, 2010 at 8:33 AM, mattyh88 <mathew.hu...@...>
wrote:
> > > Hi,
> >
> > > I''m trying to setup the Authlogic gem. I''ve
followed this tutorial:
> > > (because I''m using Rails 3)
> >
>http://www.logansbailey.com/2010/10/06/how-to-setup-authlogic-in-rail...
> >
> > > All of this works. But now I''d like to render the login
form as a
> > > partial on every page of my site.
> >
> > > 1) I''ve rendered the partial in my application.html.erb
file as
> > > followed:
> >
> > > <%= render :partial => "user_sessions/form" %>
> >
> > > 2) When I start my server and try rendering my index view of my
home
> > > controller, I get the following error:
> >
> > > undefined method `model_name'' for NilClass:Class
> > > Extracted source (around line #1):
> > > 1: <%= form_for(@user_session) do |f| %>
> > > 2:   <% if @user_session.errors.any? %>
> > > 3:     <div id="error_explanation">
> > > 4:       <h2><%= pluralize(@user_session.errors.count,
"error") %>
> > > prohibited this user_session from being saved:</h2>
> >
> > > 3) I figured out I had to make a new @user_session var in the
action
> > > method of my controller for every view I''d like to
render my login
> > > form partial on.
> >
> > > 4) I''ve put @user_session = UserSession.new in the
"new"-action-method
> > > in my home controller and so my index view rendered fine. But now
I''d
> > > like to render my login form on every page of my site.
> >
> > > Is there a way to set the @user_session for every action? Like in
the
> > > application_controller? How would you do that?
> >
> > You should able to do this in the application_controller:
> >
> > before_filter :new_user_session
> >
> > private
> >
> > def new_user_session
> >   @new_user_session = UserSession.new
> > end
> >
> > Try that, should then have the @new_user_session available to you
since all
> > controllers inherit from application controller.
> >
> >
> >
> >
> >
> > > Thank you,
> > > Mathew
> >
> > > --
> > > You received this message because you are subscribed to the
Google Groups
> > > "Ruby on Rails: Talk" group.
> > > To post to this group, send email to rubyonrails-talk@...
> > > To unsubscribe from this group, send email to
> > >
> rubyonrails-talk+unsubscribe@...<rubyonrails-talk%2Bunsubscrib e
<at>
googlegroups.com>
> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/rubyonrails-talk?hl=en.
> 

I am trying to do the same thing.  I followed the same tutorial, added the 

@user_session = UserSession.new

(tried both the home controller and application controller)

but I am still getting 

ActionView::Template::Error (undefined method `model_name'' for
NilClass:Class):
    1: = form_for @user_session do |f|
    2:   -if @user_session.errors.any?
    3:     #error_explanation
    4:       %h2= "#{pluralize(@user_session.errors.count,
"error")} prohibited
this user_session from being saved:"
  app/views/user_sessions/_form.html.haml:1:in
`_app_views_user_sessions__form_html_haml__892280163_96031200''
  app/views/home/index.html.haml:6:in
`_app_views_home_index_html_haml__1051594895_96219820''


Any idea how to solve this?  Everything else works fine, as described in the
tutorial.  I am just unable to render the partial user_sessions/form from
anywhere else, i.e. it''s only working from user_sessions/new.

I''d appreciate any help, I''ve been struggling with this for a
while and cannot
figure it out.


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